These are some common issues / resolutions in HAXcms related to installation, publishing, etc.
Your username and password can be found in _config/config.php on the server (assuming local development)
Realize that everything is just a file and that our json outline schema is very easy to read. So if there's an issue with something related to publishing, check _sites/mysite/site.json for publishing, then _config/config.json. All settings and variables cascade in this way. Settings are stored globally, then replicated locally to allow them to be pealed off and more easily imported / exported into other setups.